BSA red dot
I have a BSA red dot on my 10/22. This setup is great for plinking out to 50 or so yards, but the scope has a terrific parallax problem. If you hold the rifle completely still and move your head around on the stock, the dot will appear to move within the scope, possibly even all the way to the extreme edge of the tube, even though the gun didn't move. However, it's not hard to remember to mount the gun correctly.